KR20140002980A

KR20140002980A - Heating equipment for vaccuum vessel of rh vacuum degassing apparatus

Info

Publication number: KR20140002980A
Application number: KR1020120070098A
Authority: KR
Inventors: 박근호; 양정승; 장철호
Original assignee: 현대제철 주식회사
Priority date: 2012-06-28
Filing date: 2012-06-28
Publication date: 2014-01-09

Abstract

The present invention relates to a vacuum tank heating apparatus of the RH vacuum degassing apparatus, and is formed vertically into the vacuum chamber at the top of the vacuum chamber of the RH vacuum degassing apparatus, the end of the vertical lance and the vertical lance is formed in the gas passage therein In the vacuum chamber heating apparatus of the RH vacuum degassing apparatus is disposed in parallel to the bottom of the vacuum chamber, and comprising flame means for burning the gas introduced through the gas passage of the vertical lance to discharge the flame to the wall surface of the vacuum chamber. to provide.

Description

HEATING EQUIPMENT FOR VACCUUM VESSEL OF RH VACUUM DEGASSING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vacuum tank heating apparatus of an RH facility, which is a vacuum circulation degassing facility, and more particularly, to an apparatus for heating a vacuum tank of an RH vacuum degassing apparatus for more precisely controlling components in molten steel that has been refined.

The steelmaking process that uses iron ore as a raw material to produce steel as final product starts with a steelmaking process that dissolves iron ore in the blast furnace. A molten steel is prepared by performing preliminary treatment such as talline on a molten iron which is an iron ore-dissolved form.

The molten steel prepared as described above undergoes a first refining process to remove impurities, and then undergoes a second refining process to finely adjust the components in the molten steel. When the second refining is completed, the adjustment of the components in the molten steel is completed. After the secondary refining is completed, the molten steel is moved to the continuous casting process, and a semi-finished product such as slab, bloom, billet and the like is formed through the continuous casting process. The semi-finished product thus formed is manufactured into a desired final product such as a rolling coil and a heavy plate through a final molding process such as rolling.

Secondary refining is a process to finely adjust the components in the molten steel that has been first refined in the converter to control the components and materials of the final product according to the requirements. The main process of secondary refining is the degassing process which removes carbon, nitrogen, oxygen, hydrogen, etc. in the molten steel by using vacuum degassing and reflux degassing equipment.

Related prior arts include Korean Patent Laid-Open Publication No. 1999-0051982 (published: July 05, 1999, titled: “Method for heating molten steel of vacuum circulating degassing equipment and apparatus thereof”).

The present invention relates to a vacuum chamber heating apparatus of an RH vacuum degassing apparatus capable of efficiently raising the temperature inside a vacuum chamber of the RH vacuum degassing apparatus.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above.

The vacuum degassing chamber heating apparatus of the present invention for achieving the above object is formed vertically into the vacuum chamber in the upper portion of the vacuum chamber of the RH vacuum degassing apparatus, the vertical lance and the vertical lance of the gas passage formed therein At the end, it is disposed parallel to the bottom of the vacuum chamber, the vacuum chamber heating apparatus of the RH vacuum degassing apparatus including a flame means for burning the gas introduced through the gas passage of the vertical lance to discharge the flame to the wall of the vacuum chamber can do.

Specifically, the flame means may be characterized in that at least one flame ball for injecting the flame toward the wall surface of the vacuum chamber.

The vertical lance may be characterized in that the flame means is rotated in a horizontal state on the bottom of the vacuum chamber.

The vertical lance may be characterized in that it is moved up and down in the vacuum chamber.

It may be characterized by heating the inner wall surface of the vacuum chamber while moving from the bottom to the top of the vertical lance vacuum chamber.

As described above, the present invention directly heats the inner wall of the vacuum chamber of the RH vacuum degassing apparatus, thereby reducing the vacuum preheating time and reducing the energy consumed in the preheating, thereby improving the process efficiency.

1 is a view schematically showing a vacuum vessel heating apparatus of the RH vacuum degassing apparatus according to an embodiment of the present invention.
2 is a perspective view showing a flame means according to an embodiment of the present invention.
3 is a plan view showing a flame means according to an embodiment of the present invention.
4 is a perspective view showing a flame means according to other embodiments of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference symbols whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In general, the slag flowing out of the converter when the converter is lowered includes a lower oxide, and the lower oxide is a cause of deterioration in the cleanliness of molten steel, so the slag phthalate treatment is performed to reduce the content of the lower compound when the converter is lowered.

In order to perform the degassing of the molten steel, the molten steel exited from the converter is taken from the ladle and transferred to the vacuum circulating degassing equipment. Various devices such as DH, RH, Tank Degasser have been developed as vacuum degassing apparatus, but RH vacuum degassing apparatus is generally used as a representative apparatus. One of the most important functions of this RH vacuum degassing apparatus is the decarburization function for undeoxidized molten steel. The RH vacuum degassing apparatus is a device for removing gas in the molten steel from the upper portion of the ladle receiving the molten steel.

This RH vacuum degassing apparatus performs a number of processes and then replaces the refractory on the inner wall and performs a new operation. At this time, by first heating the inside of the vacuum chamber before starting a new operation, the molten steel can be prevented from adhering to the wall of the vacuum chamber to solidify, and the temperature of the molten steel can be suppressed from dropping. In addition, since the aluminum alloy iron required to raise the molten steel is not necessary, it is possible to reduce the production cost while manufacturing high-purity steel by preventing the occurrence of inevitable inclusions when the temperature of the molten steel is raised again.

As such, it is important to preheat the vacuum bath for the RH treatment. In general, the RH vacuum degassing apparatus uses a method of raising the temperature of the vacuum chamber by increasing the temperature inside the vacuum chamber by using a torch fixed at the upper portion of the vacuum chamber. In this method, since the wall of the vacuum chamber is heated by the convection of air inside the vacuum chamber heated by the torch, the thermal conductivity drops, and the amount of gas must be increased and heated for a long time in order to heat to the bottom of the vacuum chamber.

1 is a view showing a vacuum chamber heating apparatus for RH vacuum degassing according to an embodiment of the present invention, the vacuum chamber heating apparatus 100 of the present invention comprises a vertical lance 110 and flame means 130 do.

The vertical lance 100 is formed in the vertical direction in the vertical direction from the top of the vacuum chamber 10 to the inside of the vacuum chamber 10, it is in the form of a bar (bar) formed therein. The vertical lance 100 is movable up and down in the vacuum chamber 10 and is rotatable in a direction horizontal to the bottom of the vacuum chamber 10. The vertical lance 100 is movable from the bottom to the top, and the thermal conductivity increases as the upper portion goes up from the bottom of the vacuum chamber 10 according to the tropical flow characteristic of moving from the high temperature to the low temperature of the thermal energy. As a result, the thermal efficiency inside the vacuum chamber 10 can be further increased, and the heating time of the vacuum chamber 10 can be reduced. At this time, the shangdong of the vertical lance 100 may be operated by a cylinder. In addition, the rotation of the vertical lance 100 may be made by a motor.

The flame means 130 is connected to the end of the vertical lance 100, is disposed in parallel to the bottom of the vacuum chamber 10, the gas flows through the inside to burn the gas to discharge to the flame. At this time, the gas used is preferably oxygen.

2, 3 and 4, the flame means 130 is preferably formed with at least one flame port (130a) for injecting the flame toward the wall surface of the vacuum chamber (10).

Specifically, as shown in FIG. 2, the flame means 130 may have one flame ball 130a formed on each side of the main body formed of a cube to emit flames.

As shown in Figure 3, the flame means 130 is a flame ball 130a is formed on the main body of the cube may emit a flame.

As shown in FIG. 4, the flame means 130 has one flame ball 130a formed along the side surface of the cylindrical main body to radiate the flame to the outside. The flame means 130 formed as described above is rotatable in a horizontal direction on the bottom of the vacuum chamber 10 together with the vertical lance 110, and radiates a flame directly on the surface of the vacuum chamber 10 in a short time. ) Heat the surface. At this time, the flame means 130 and the vertical lance 110 can be rotated in one direction or in both directions. In addition, the vacuum chamber heating apparatus 100 may control the flame radiation position through a computer system.

According to the present invention, the heating device directly heats the surface of the vacuum chamber to shorten the time of preheating the vacuum chamber 10, and reduces the amount of gas consumed for preheating, thereby reducing the time and cost consumed in the process. have.

The vacuum vessel heating apparatus of the vacuum degassing apparatus in the RH process as described above is not limited to the configuration and operation of the embodiments described above. The above embodiments may be configured such that various modifications may be made by selectively combining all or part of the embodiments.

10: vacuum chamber 100: heating device
110: vertical lance 130: flame means
130a: fireball

Claims

A vertical lance formed vertically in the upper part of the vacuum chamber of the RH vacuum degassing apparatus and having a gas passage formed therein; And
RH vacuum degase equipment Vacuum chamber heating device.

The method according to claim 1,
The flame means of the vacuum tank heating device of the RH vacuum degassing equipment is formed with one or more flame ports for injecting the flame toward the wall surface of the vacuum chamber.

The method according to claim 1,
The vertical lance vacuum chamber heating apparatus of the RH vacuum degassing equipment is rotated in a state in which the flame means is horizontal to the bottom of the vacuum chamber.

The method according to claim 1,
The vertical lance vacuum chamber heating apparatus of the RH vacuum degassing equipment is moved up and down in the vacuum chamber.

The method according to claim 1,
The vacuum chamber heating apparatus of the RH vacuum degassing apparatus for heating the inner wall surface of the vacuum chamber while moving from the bottom to the top of the vertical lance vacuum chamber.